What is the definition or description of: plantar fasciitis?

Plantar fascitis: Pain at the area where the band of tissue referred to as the plantar fascia on the bottom of the foot inserts into the heel bone. Too much tension brings on pain. Wearing flat shoes, going barefoot on hard surfaces can be some of the causes that bring this pain. Do not let it linger too long. Can last for months. Pain mostly when standing up after sitting or sleeping.